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BTU (British Thermal Unit)

The British thermal unit (BTU) is a unit of energy used in the power, steam generation, heating and air-conditioning industries. In scientific contexts the BTU has largely been replaced by the SI unit of energy, the joule [J].

The British thermal unit (BTU or Btu) is a unit of energy used in the power, steam generation, heating and air-conditioning industries. Although it is still used 'unofficially' in metric English-speaking countries (such as USA, Canada, UK), its use has declined or has been replaced in other parts of the world. In scientific contexts the BTU has largely been replaced by the SI unit of energy, the joule [J].

The capacity of small cooling systems and heat pumps is often given in BTUs – meaning the number of BTUs per hour, i.e. BTU/h.One British Thermal Unit (BTU) is the amount of energy required to raise the temperature of a pound of water by one degree Fahrenheit.1 BTU = 1.055 kJ.1 BTU/h = 0.293 W.